const int echo = 0;
const int trig =1; 
float distance;
float duration;
void setup()
{
  Serial.begin(115200);
  pinMode(echo, INPUT);
  pinMode(trig, OUTPUT);
}
float getdistance()
{
  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);
  duration=pulseIn(echo,HIGH);
  return(duration*0.034/2);
}
void loop()
{
  distance=getdistance();
  Serial.println(distance);
  delay(10);
}